grep - Conditional Merge in R Data Frame using a String as a search -

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i prepping database plotting in ggplot plot large geom_point() plot. 1 set of point stand out , thinking of making dummy column use column color variable in:

p <- ggplot(data, aes(x-x,y-y,color=color) colors=c("yes"="orange2", "no"="grey") scale_color_manual(values=colors)

to make dummy column wanted follows:

df$color <- "no"

to set default color, , use grep substitute make highlight color.

df$color[grep("string", df$v1, ignore.case=t),] < "yes"

where v1 column contains string substitute. although love suggestions on how substitution interested in learning more direct coloring method involve highlighting data of particular value.

thanks

here 1 way using grepl. using mtcars data set illustrative purposes. want merc stand out. can call

ggplot(mtcars, aes(mpg, hp)) +   geom_point(aes(colour = grepl('merc', rownames(mtcars)))) +   scale_colour_manual("merc", values = c('black', 'red'))

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